changed commute-sentence to justice with command option pardon

docs/justice.rst

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+justice
+=======
+
+.. dfhack-tool::
+    :summary: Commands related to the justice system
+    :tags: fort armok units
+
+This tool allows control over aspects of the justice system, such as the
+ability to pardon criminals.
+
+usage
+-----
+
+::
+    justice pardon [--unit <id>]
+
+Pardon the selected unit or the one specified by unit id if provided. Currently
+only applies to prison time and doesn't cancel beatings or hammerings.
+
+
+options
+-------
+
+``-u``, ``--unit <id>``
+    Specifies the unit id of the target of the command.

justice.lua

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+
+local argparse = require('argparse')
+
+local function pardon_unit(unit)
+    for _,punishment in ipairs(df.global.plotinfo.punishments) do
+        if punishment.criminal == unit.id then
+            punishment.prison_counter = 0
+            return
+        end
+    end
+    qerror('Unit is not currently serving a sentence!')
+end
+
+local function command_pardon(unit_id)
+    local unit = nil
+    if not unit_id then 
+        unit = dfhack.gui.getSelectedUnit()
+        if not unit then qerror("No unit selected!") end
+    else 
+        unit = df.unit.find(unit_id)
+        if not unit then qerror(("No unit with id %i"):format(unit_id)) end
+    end
+    if unit then pardon_unit(unit) end
+end
+
+local unit_id = nil
+
+local args = {...}
+
+local positionals = argparse.processArgsGetopt(args,
+    {'u', 'unit', hasArg=true, handler=function(optarg) unit_id = optarg end}
+)
+
+local command = positionals[1]
+
+if command == "pardon" then
+    command_pardon(unit_id)
+end
+
+qerror(("Unrecognised command: %s"):format(command))